Using a singleton or an enum like MissingType to represent missing data provides not only simplicity but also type-checking benefits, ensuring better code reliability.
Type checkers will recognize that MISSING is the only possible value of MissingType, allowing for safe type checks with is, enhancing code clarity and correctness.
Unlike traditional custom initializations to handle null objects, utilizing a single-value enum automatically prevents the allocation of unintended additional instances, thus reducing potential bugs.
The semantic behavior of single-value enums mirrors singletons, allowing developers to avoid redundant complexities and ensuring consistent handling of missing values across the codebase.
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